612155720 has 64 divisors (see below), whose sum is σ = 1590969600. Its totient is φ = 209505280.

The previous prime is 612155689. The next prime is 612155759. The reversal of 612155720 is 27551216.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33440 + ... + 48399.

It is an arithmetic number, because the mean of its divisors is an integer number (24858900).

Almost surely, 2^612155720 is an apocalyptic number.

It is an amenable number.

612155720 is an abundant number, since it is smaller than the sum of its proper divisors (978813880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

612155720 is a wasteful number, since it uses less digits than its factorization.

612155720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81878 (or 81874 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 612155720 is about 24741.7808574888. The cubic root of 612155720 is about 849.0904781157.

The spelling of 612155720 in words is "six hundred twelve million, one hundred fifty-five thousand, seven hundred twenty".